Hi Steve, Steve French wrote: > A couple clarifications: > > 1) We really want the network file systems > to be unmounted (or at least synced) before the network goes away. > You do not want to risk losing file system data which has been cached > by the Linux memory management layer. > > 2) If there is cached write data, we do want the file system to try > as hard as reasonably possible (perhaps forever in the case of > mounting with the "hard" mount option rather than the default "soft" > mount) before giving up - the network which is down for a few > seconds, may recover in most cases (where exactly we are in shutdown > of the system may be hard to detect in this path in the kernel)
> 3) CIFS already does do the obvious - it does not attempt to send > network requests in umount (SMB "tree disconnect" followed by SMB > "ulogoff") if the session is already dead (the server implicitly > closes "tids" and "smb uids" when the socket crashes). Write > requests just prior to the umount getting to the kernel would cause > attempts at reconnect, but simply from the kernel cifs driver > perspective umounting should not cause network traffic if the session > is already dead I think there must be a bug somewhere in this code then. My cifs file systems are all as read only as a read-write file system can be: I almost never write to them, I just mount them by default so that I can read from them (which I also almost never do), and also write to them when I want, which is also not a daily thing. So I almost always shut down in a situation where the file system has only been read from, not written to -- and the reads are usually also a long time ago. No reason at all to wait indefinitely! For reference, all my cifs file systems are mounted below /nas/..., and the following command: # lsof | grep nas shows nothing. No files open on the shares, and it's like that for most of the time. Still, my system hangs at shutdown. There's *something* fishy going on here. Do you know of any other commands I should try to figure out if there is some dirty data left for the cifs file systems, that somehow doesn't get written? Would it help to sync before I reboot from the GUI, so that all pending dirty data is flushed to the cifs fs? Cheers, Bart -- CIFS/SMBFS shares not unmounted before network is shut down https://bugs.launchpad.net/bugs/211631 You received this bug notification because you are a member of Ubuntu Server Team, which is subscribed to samba in ubuntu. -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs
